Mohammed Atef (Arabic: محمد عاطف, Muḥammad ‘Āṭaf) (Born Sobhi Abu Sitta, also known as Abu Hafs) was the alleged military chief of al-Qaida, although his role in the organisation was not well-known by intelligence agencies for years. His death in November 2001 was one of the United States' largest and first victories in the War on Terror.
Atef served two years in the Egyptian Air Force and became an agricultural engineer. He was a police officer and a member of the group Egyptian Islamic Jihad before he moved to Afghanistan to repel the the Soviet invasion, while operating from Peshawar. He has been credited as having convinced Abdullah Azzam to abandon his life and devote himself to preaching jihad at this time.
Atef was sent to an Afghan training camp where he met Ayman al-Zawahiri, who later introduced him to Osama bin Laden.